Sofa



FIG. 1 is a perspective view of a sofa, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof, the opposite side being a mirror image; and,

FIG. 5 is a top view thereof. 

CLAIM I claim, the ornamental design for a sofa, as shown and described. 